FOEAMINIFERA OF THE ATLANTIC OCEAN. 6 



added, the last-formed one the largest and covering most of the 

 preceding ones; sutures not depressed, rather indistinct; wall smooth, 

 translucent, usually very thin and conspicuously punctate; aperture 

 a curved, somewhat arched opening between the base of the chamber 

 and the preceding one, often with a slightly thickened somewhat 

 flaring lip. 



Length up to 1 mm. 



Distribution. — This species seems to have a very wdde distribution 

 in both tropical and temperate seas and at considerable depths. 

 It has many characters wdiich seem to indicate a possibility for 

 pelagic condition. It is a very thin-walled species compared with 

 Chilostomella grandis Cushman, which is certainly a bottom-living 

 form. There are numerous Albatross records, as the accompanying 

 table shows, and the species is also known from the eastern Atlantic, 

 especially ofT the British Isles. It occurs also in the Indo-Pacific 

 at scattered stations. 



Chilostomella ovoidea — material examined. 



Genus ALLOMORPHINA Reuss, 1850. 



Allomorphina Reuss (type, A. trigona Reuss), Denkschr. Akad. Wiss. 

 Wien, vol. 1, 1850, p. 380. — H. B. Brady, Rep. Voy. Challenger, Zoology, 

 vol. 9, 1884, p. 437.— CH.A.PMAN, The Foraminifera, 1902, p. 183. — 

 Cushman, Bull. 71, U. S. Nat. Mus., pt. 4, 1914, p. 3. 



